Joel mou



J0EE MOULTON, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 77,518, dated May 5, 1868.

IMPROVEMENT IN THE MANU]E'A0'.l3UlEtE 0E ELASTIG ROLLS.

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TO ALL TO WHOM THESE PRESENTS suaLL COME:

Be it known that I, JOEL MoULToN, of Boston, in the county of Suffolk,and State of Massachusetts, have invented a new and useful Improvementin the Manufacture of Elastic Rolls, and in material for" constructingsuch rolls, as well as for other purposes; and do hereby declare thefollowing to be a full, clear, and exact description thereof, duereference being had to the accompanying drawings, making part of thisspecification, and in which I Figure l is a perspective view, showing myinvention in a preparatory state.

Figure 2 is a transverse section. of a finished roll.

Figure 3, a face view, and

Figure 4 a transverse section of modifications of my invention.

My present invention may be considered in the light of an improvementupon that shown and described in Letters Patent, No. 75,292, and bearingdate thelQth day of March, 1868, and issued to me for an improved mannfacture of elastic rolls, and consists in means ofproviding for greatersecurity against slipping of the elastic body of the roll about or uponits shaft, as well as a novel mode of combining the fibrous materialwith the rubber, whereby equally good results are obtained atconsiderable decrease in cost, as compared with the mode,

shown in Letters Patent before referred to. I

In carrying out the first portion of my invention, I takea strip, a, ofWoven webbing, about three-fourths of an inch in width, or thereabouts,and apply to its opposite strides two strips 6 b, of thin vulcanizedIndia rubber, leaving a narrow space, 0, in the middle of the webbing,upon each side thereof, and between such rubber strips. I then fold thestrips of webbing in the centre, and enclose in the fold a metallicwire, d, and wind the folded strip spirally about the shaft e, from endto end thereof, between its journals, the whole being then subjected tothe ordinary vulcanizing process, which makes a firm, compact, and, tosome extent, homoe genous mass of the rubber and webbing.

In winding the strip containing, the metallic wire about the shaft e,previous to vulcanizing the former, it is to be applied thereto withconsiderable power, and the ends of suchwire securely fiired to theshaft.

The employment of the metallic wire confines-the elastic body of theroll to its shaft in a much closer man= ner, and causes it to cling moretightly thereto than would be thecase were the wire to be omitted, andrender slipping of the roll about the shaft nearly or quite impossible.

The object in applying the elastic strip of rubber to the webbing, asbefore described, is to bring the Web-' bing alone in contact with theshaft.

I do not, of course, intend to confine myself to the before-describedmode of preparing the strips before apply ing the wire thereto, as thismay be varied considerably without changing the character'of thisportion of my invention, which embraces thelidea of closely confiningthe elastic roll to its, shaft by means of a metallic wire.-

In carrying out the second portion of my present invention orimprovement,.I apply transversely to a sheet, or between two sheets ofvulcanized rubber, a layer or range'of-strands of fibrous material, andsubsequently cut this sheet into ribbonsof the desired width,at rightangles to the length of the strands, and proceed to form the stripssubstantially asbeforedescribed.

The object of thismode of applying the strands, as compared with theemployment of the woven webbing, as shown in Letters Patent beforereferred to, being, as before observed, to reduce the cost ofmanufacture, which practice has determined results from such applicationof the strands, at the same time enabling me to retain the advantageresulting from the radiating of the strands from the circumference ofthe shaft outward.

As a packing for the pistons of steam-engines, as well as for variousother purposes, the combination of the rubber and the fibrous strands,as before explained, will be found to be of value. I would remark that astring can be employed instead of a metallic wire.

I claim as my invention, and desire to secure by Letters Petent- 1. As ameans of more securely fixing the body of an elastic roll to its shafts,the employment therewith of a metalliewire or string.

2. The mode, herein described, of applying the strands offibrousmoterial to a sheet, or between two sheets, of vulcanized rubber,essentially in manner and for the purpose as set forth.

JOEL MOULTON. Witnesses:

EDWARD GRIFFITH, FRED. CURTIS.

